JP3021025U - Reversible color paper - Google Patents

Abstract

(57) Abstract: To provide a reversible photosensitive color paper that develops color by sunlight (ultraviolet rays) and returns to the original color by blocking or heating of sunlight (ultraviolet rays). SOLUTION: A base layer (2) made of urethane medium and urethane white ink is provided on one side of a paper (1), and a light emitting layer (3) made of urethane medium, urethane isocyanate curing agent and organic photochromic particles is provided thereon. A reversible light-sensitive coloring paper provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a novel photosensitive color paper, and more specifically, it uses organic photochromic particles to develop color when exposed to sunlight (mainly ultraviolet rays), and to block the sunlight (mainly ultraviolet rays) or to be heated. Reversible color-reversible color paper.

[0002]

[Prior art]

 Conventionally, organic photochromics that develop color when exposed to sunlight (mainly ultraviolet rays) have been used for various things. For example, sunglasses, goggles, paints, toys, etc. It is well known that the color development of organic photochromic is because when the molecular structure of spirooxazine contained in the organic photochromic is exposed to ultraviolet light, the bond is broken and the ring is opened to form an ionic structure.

[0003]

[Problems to be solved by the device]

 When this organic photochromic is mixed in materials such as glass products and plastic products, the organic photochromic particles are stably fixed in the solidified material. Although the reversibility is not impaired, organic photochromic particles are exposed when coated on a soft and relatively rough material such as paper or mixed during paper making, and the effect of air, humidity, etc. is exposed. Since it is not stable after receiving it, it does not develop enough color even when exposed to ultraviolet rays, or it does not return to the original color even if it develops color, and it is not possible to clear certain conditions as a photosensitive color paper, so until now organic photochromic was used No reversible sensitized colored paper was provided. The present invention has developed a technology for stably coating organic photochromic on paper, which makes it possible to provide a photosensitive coloring paper that reversibly changes color in a few seconds. By applying the fact that the color of the paper is different from the color printed on general white paper, it provides a reversible sensitized color developing paper with a new construction and new application.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the reversible light-sensitive color developing paper of the present invention comprises a base layer made of urethane-based medium and urethane-based white ink on one side of the paper as a base, and a urethane-based medium and urethane-based isocyanate curing agent on the upper layer. And a light emitting layer composed of photochromic particles.

[0005]

[Action]

 The reversible sensitized color developing paper of the present invention develops color when exposed to sunlight (mainly ultraviolet rays) and utilizes the color change itself. Furthermore, color printing is performed on the surface of the sensitized color developing paper to make the printed pattern complicated. You can get a great color change. Since the base layer consisting of urethane-based medium and urethane-based white ink is a photosensitive coloring paper, it is frequently exposed to sunlight (ultraviolet rays), so it improves the light resistance of the base paper. The light-emitting layer, which consists of a mixture of isocyanate-based curing agent and organic photochromic particles, wraps the organic photochromic particles in a urethane-based isocyanate curing agent for stable fixation, and provides an excellent reversible color development effect as a reversible photosensitive color paper. Make it durable and have excellent durability.

By developing these two layers, the present invention has succeeded in stably holding the organic photochromic on the paper and imparting stable durability as the light-sensitive color developing paper. The base layer of the urethane Mejiumu 10 parts by weight, urethane-based white ink 1 part by weight lay preferred, in the actual coating have use by dissolving the mixture in a solvent 3 parts by weight, and WETm 2 / ^12g, the light-emitting layer of the urethane 10 parts by weight of medium, 0.5 parts by weight of urethane-type isocyanate curing agent, and 0.1 parts by weight of organic photochromic particles are preferable. In actual coating, the mixture is used by dissolving in 3 parts by weight of solvent, and WETm ² It is preferably / 13 g. The paper as the base material is not limited at all, but roll paper is preferable for the coating of the base layer and the light emitting layer and stable production. The organic photochromic basically changes from colorless → blue → colorless, colorless → yellow → colorless, colorless → red → colorless, but in the present invention, any organic photochromic can be used, You may use what mixed multiple types.

The light-sensitive color developing paper of the present invention may be configured to partially develop color, but in principle, it is manufactured in advance so that the entire surface of one side is colored, and in actual use, it is not desired to develop the color. Should not be colored by a method such as printing. In principle, the photosensitive color paper of the present invention can be used in the same manner as ordinary paper, and in particular, it exhibits a more effective effect by cooperating with color printing. Of course, it may be used. Examples of applications of the light-sensitive coloring paper of the present invention include labeling products for detection of chemicals that dislike ultraviolet rays, foods (it can be seen that ultraviolet rays are exposed to the color), calendars, posters, POP, fancy goods, etc. is there.

[0008]

【Example】

The photosensitive color paper of the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional view of a photosensitive color paper according to the present invention. Using a 150 mesh (line) roll-set gravure coater, 10 parts by weight of urethane-based medium and 1 part by weight of urethane-based white ink on one side of a white fine roll paper 1 with a width of 1,120 mm and 104.7 g / m ^2. parts, the solvent (trawl + Sakuechi + isopropyl alcohol) 3 parts by weight mixture of coated substrate 2 so as to be WET ^m 2/12 g. After the base layer 2 is dried, 10 parts by weight of a urethane-based medium, 0.5 part by weight of a urethane-based isocyanate curing agent, 0.1 part by weight of organic photochromic particles, and 3 parts by weight of a solvent (troll + sequetia + isopropyl alcohol) on the base layer 2 are dried. mixture was coated coloring layer 3 so as to be WE T ^m 2 / 13g.

The photosensitive color paper thus produced was cut from a roll into a sheet having a size of 395 m / m × 545 m / m, and the design shown in FIG. 2 was printed by offset printing. First, except the empty part where you want to change the color, print the other part (shaded) where you do not want to change the color 4 with white ink to prevent light transmission, and then Four-color offset printing was performed. This printed material had a normal cloudy sky when it was placed near a window at night when there was little sunlight (ultraviolet rays), but when it was exposed to sunlight (ultraviolet rays) during the day, it became a beautiful blue sky. When the sun went down, it returned to its original cloudy sky.

[0010]

[Effect of device]

 The surface of the light-sensitive coloring paper of the present invention is colored by sunlight (ultraviolet rays), and the color change can be used even if it is used as it is, but by printing it like ordinary paper, parts that do not develop color, simple By creating a part that develops color and a part that changes the color printed by coloring, a complicated color change occurs and a printed matter that can enjoy the color change can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a photosensitive color paper of the present invention.

FIG. 2 is a diagram showing an example in which a landscape is printed using the photosensitive color paper of the present invention.

[Explanation of symbols]

1 White fine paper 2 Base layer 3 Light emitting layer 4 Part printed with white ink to prevent light transmission

Claims (1)

[Scope of utility model registration request] 1. A reversible light-sensitive color-developing paper comprising a base layer made of urethane-based medium and urethane-based white ink on one side of the paper, and a light-emitting layer made of urethane-based medium, urethane-based isocyanate curing agent and organic photochromic particles as an upper layer. .